Portable speaker



FIG. 1 is a perspective view of a portable speaker;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a portable speaker, as shown and described. 